Low noise amplifier and radio frequency module

Abstract

The invention discloses a low-noise amplifier and a radio frequency module, and relates to the technical field of radio frequency, the low-noise amplifier comprises an active path and a passive path, the active path and the passive path share an input circuit and an output circuit, and the gain range of the active path is at least partially larger than that of the passive path. When the active path and the passive path are conducted in a time-sharing manner, the low-noise amplifier can have different gain gears, so that the gain can be adjusted; moreover, an inductor group is arranged between the input circuit and the output circuit of the active path or between the input circuit and the output circuit of the passive path, and the inductor group comprises a first coil and a second coil which are opposite in spiral direction. The current change on one of the first coil and the second coil can induce induced current with opposite phases on the other coil, so that the phase shift is performed on the signal, and finally the phase of the signal output by the time-sharing conduction of the active path and the passive path is continuous.

Description

Technical Field

[0001] The present application relates to the field of radio frequency technology, and in particular to a low noise amplifier and a radio frequency module. Background Art

[0002] As an important component of the RF front end, the low noise amplifier (LNA) is responsible for receiving and processing weak signals from the antenna, amplifying the signal and suppressing the introduction of noise as much as possible. Its main parameters include noise figure, gain, input and output matching, linearity, reverse isolation, etc.

[0003] In consumer electronics applications, the LNA of the RF front end needs to meet the requirements of a large dynamic signal reception range to be able to receive signals of different strengths, have sufficient amplification capabilities when receiving weak signals, and have sufficient linearity when receiving large signals to ensure that the signal is not distorted. In addition, the LNA is required to be able to achieve different gain adjustments to meet the requirements of receiving gain and linearity for receiving signals of different strengths. For example, the gain range can be adjusted from below -10dB to 20dB gain in multiple gears. The general method is to use active channels and passive channels to achieve high and low gain adjustment. Some receiving link platforms also require the continuity of phase at different gain levels.

[0004] However, for an LNA with only an active path, when the gain is switched, or for an LNA with only a passive path, when the gain is switched, the phase change is small. But for an LNA including an active path and a passive path, when the active path and the passive path are switched, a large phase change (about 180° phase difference) usually occurs, which cannot meet the phase continuity requirements under different gain levels. Summary of the invention

[0005] In order to solve the above technical problems, the embodiments of the present application provide a low noise amplifier and a radio frequency module, so that the LNA including an active path and a passive path can achieve phase continuity of the output signals of the active path and the passive path while the active path and the passive path are switched to meet different gain gears.

[0006] To achieve the above objectives, the present application provides the following technical solutions: In a first aspect, an embodiment of the present application provides a low noise amplifier, the low noise amplifier comprising an active path and a passive path, the active path and the passive path sharing an input circuit and an output circuit; The active path and the passive path are turned on in a time-sharing manner, and the gain range of the active path is at least partially greater than the gain range of the passive path; An inductor group is provided between the input circuit and the output circuit of the active path, or between the input circuit and the output circuit of the passive path. The inductor group includes a first coil and a second coil. The spiral direction of the first coil is opposite to that of the second coil. The inductor group is used to phase shift the signal so that the phases of the signals output by the active path and the passive path in time-sharing conduction are continuous.

[0007] Optionally, the inductor group is provided between the input circuit and the output circuit of the active path; The first end of the first coil is connected to the active path; the second end of the first coil and the first end of the second coil are connected as a common end and electrically connected to the power supply voltage end; the second end of the second coil is connected to the active path.

[0008] Optionally, the active path includes the input circuit, the first amplifier tube, the second amplifier tube, the inductor group and the output circuit which are electrically connected in sequence along the signal transmission direction; The first end of the input circuit is a signal input end, and the second end of the input circuit is electrically connected to the control end of the first amplifier tube; The control end of the first amplifier tube is also connected to the first bias voltage through the first resistor; the first end of the first amplifier tube is electrically connected to the second amplifier tube, and the second end of the first amplifier tube is grounded through the feedback circuit; the first amplifier tube is used to invert and amplify the signal; The control end of the second amplifier tube is connected to the second bias voltage through the second resistor and is grounded through the first capacitor; the first end of the second amplifier tube is electrically connected to the first end of the first coil in the inductor group, and the second end of the second amplifier tube is electrically connected to the first end of the first amplifier tube; the second amplifier tube is used to amplify the signal in phase; The second end of the second coil in the inductor group is electrically connected to the first end of the output circuit, and the second end of the output circuit is a signal output end.

[0009] Optionally, the inductor group is provided between the input circuit and the output circuit of the passive path; The first end of the first coil is connected to the passive path; the second end of the first coil and the first end of the second coil are connected as a common end and electrically connected to the ground; the second end of the second coil is connected to the passive path.

[0010] Optionally, the passive path includes the input circuit, the first switch, the first attenuation circuit, the second capacitor and the output circuit electrically connected in sequence along the signal transmission direction, and the inductor group is located between the first switch and the second capacitor.

[0011] Optionally, the inductor group is located between the first switch and the first attenuation circuit; Alternatively, the inductor group is located between the first attenuation circuit and the second capacitor; Alternatively, the inductor group is located on a path where the first attenuation circuit overlaps with the passive path.

[0012] Optionally, in the inductor group, the first coil is located in a first metal layer, the second coil is located in a second metal layer, and the first metal layer and the second metal layer are arranged in different layers; The orthographic projection of the second coil on the first metal layer at least partially overlaps with the first coil.

[0013] Optionally, the low noise amplifier further includes a phase fine-tuning unit, which includes at least one capacitor and / or at least one inductor, and the inductor group and the phase fine-tuning unit together make the phases of the signals output by the active path and the passive path in time-sharing continuous.

[0014] Optionally, the phase fine-tuning unit includes a first phase fine-tuning unit, and the inductor group and the first phase fine-tuning unit are located between the input circuit and the output circuit of the active path, or between the input circuit and the output circuit of the passive path.

[0015] Optionally, at least one of the first end of the first coil and the second end of the second coil in the inductance group is also grounded through one of the first phase fine-tuning units.

[0016] Optionally, the first phase fine-tuning unit includes a third capacitor and / or a third coil; When the first phase fine-tuning unit includes the third coil, and the third coil is electrically connected to the first coil or the second coil, the third coil and the corresponding electrically connected first coil or the second coil are wound continuously.

[0017] Optionally, the phase fine-tuning unit includes a second phase fine-tuning unit; The inductor group is located between the input circuit and the output circuit of the active path, and the second phase fine-tuning unit is located between the input circuit and the output circuit of the passive path; Alternatively, the inductor group is located between the input circuit and the output circuit of the passive path, and the second phase fine-tuning unit is located between the input circuit and the output circuit of the active path.

[0018] Optionally, the phase fine-tuning unit includes a third phase fine-tuning unit; the output circuit includes a fourth capacitor and a second attenuation circuit electrically connected in sequence along the signal transmission direction, and the common end of the fourth capacitor and the second attenuation circuit is grounded through the third phase fine-tuning unit.

[0019] In a second aspect, an embodiment of the present application provides a radio frequency module, comprising any one of the above-mentioned low noise amplifiers.

[0020] Compared with the prior art, the above technical solution has the following advantages: The low noise amplifier provided in the embodiment of the present application includes an active path and a passive path. The active path and the passive path share an input circuit and an output circuit. The gain range of the active path is at least partially larger than the gain range of the passive path. In this way, when the active path and the passive path are turned on in time-sharing mode, the low noise amplifier can have different gain gears. For example, a medium-high gain gear can be achieved when the active path is turned on, and a low gain gear can be achieved when the passive path is turned on, thereby achieving adjustable gain; and an inductor group is arranged between the input circuit and the output circuit of the active path, or between the input circuit and the output circuit of the passive path, and the inductor group includes a first coil and a second coil with opposite spiral directions. In this way, a current change in one of the first coil and the second coil can induce an induced current with an opposite phase in the other coil, thereby performing phase shifting on the signal, and finally making the phase of the signal output by the active path and the passive path turned on in time-sharing mode continuous.

[0021] Other objects and advantages of the present application will be described in detail in the following embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the circuit structure of a low noise amplifier provided in an embodiment of the present application; Figure 2 A schematic diagram of the circuit structure of another low noise amplifier provided in an embodiment of the present application; Figure 3 A schematic diagram of the circuit structure after removing the inductor group from the low noise amplifier provided in the embodiment of the present application; Figure 4 It is a schematic diagram of the layout structure of the load inductor L0; Figure 5 A schematic diagram of the layout structure of a first coil L1 and a second coil L2 of an inductor group located between an input circuit and an output circuit of an active path in a low noise amplifier provided in an embodiment of the present application; Figure 6a for Figure 3 The simulation test result diagram of the low noise amplifier shown in FIG. 1 when the active path is turned on; Figure 6b for Figure 3 The simulation test result diagram of the low noise amplifier shown in FIG. 1 when the passive path is turned on; Figure 7a for Figure 1 The simulation test result diagram of the low noise amplifier shown in FIG. 1 when the active path is turned on; Figure 7b for Figure 1 The simulation test result diagram of the low noise amplifier shown in FIG. 1 when the passive path is turned on; Figure 8 A schematic diagram of the circuit structure of another low noise amplifier provided in an embodiment of the present application; Fig. 9 A schematic diagram of the circuit structure of another low noise amplifier provided in an embodiment of the present application; Fig.10 A schematic diagram of the layout structure of a first coil L1 and a second coil L2 of an inductor group located between an input circuit and an output circuit of a passive path in a low noise amplifier provided in an embodiment of the present application; Fig.11a for Figure 2 The simulation test result diagram of the low noise amplifier shown in FIG. 1 when the active path is turned on; Fig.11b for Figure 2 The simulation test result diagram of the low noise amplifier shown in FIG. 1 when the passive path is turned on; Fig.12 A schematic diagram of the circuit structure of another low noise amplifier provided in an embodiment of the present application; Fig.13 A schematic diagram of the circuit structure of another low noise amplifier provided in an embodiment of the present application; Fig.14 A schematic diagram of the circuit structure of another low noise amplifier provided in an embodiment of the present application; Fig.15 A schematic diagram of the circuit structure of another low noise amplifier provided in an embodiment of the present application; Fig.16 A schematic diagram of the circuit structure of another low noise amplifier provided in an embodiment of the present application; Fig.17A schematic diagram of the circuit structure of another low noise amplifier provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0026] The present application provides a low noise amplifier. Figure 1 and Figure 2 Schematic diagram of the circuit structure of two low noise amplifiers provided in the embodiment of the present application is shown. Figure 1 and Figure 2 As shown, the low noise amplifier includes an active path 100 and a passive path 200. The active path 100 and the passive path 200 share an input circuit 10 and an output circuit 20. The active path 100 and the passive path 200 are turned on in a time-sharing manner. In this way, the input signal is amplified in the active path 100 after passing through the input circuit 10, or amplified in the passive path 200, and then output through the output circuit 20.

[0027] In the embodiment of the present application, the gain range of the active path 100 is at least partially greater than the gain range of the passive path 200. Thus, when the active path 100 and the passive path 200 are turned on in a time-sharing manner, the low noise amplifier can have different gain gears. For example, when the active path 100 is turned on, a medium-high gain gear can be achieved, and when the passive path 200 is turned on, a low gain gear can be achieved, thereby achieving adjustable gain.

[0028] As described in the background technology section, for existing low noise amplifiers including active and passive paths, a large phase change (about 180° phase difference) usually occurs when the active and passive paths are switched, which cannot meet the phase continuity requirements under different gain levels.

[0029] Based on this, Figure 1 and Figure 2 As shown, in the low noise amplifier provided in the embodiment of the present application, an inductance group 30 is arranged between the input circuit 10 and the output circuit 20 of the active path 100, or between the input circuit 10 and the output circuit 20 of the passive path 200, and the inductance group 30 includes a first coil L1 and a second coil L2, and the spiral direction of the first coil L1 is opposite to the spiral direction of the second coil L2.

[0030] It can be understood that an inductor is an element that stores energy and has two important characteristics: self-inductance and mutual inductance. When a changing current passes through an inductor, the inductor will generate a changing magnetic field. The change in the magnetic field generates an induced electromotive force at both ends of the inductor, which hinders the change in the current on the inductor, thereby causing the waveform of the current flowing through the inductor to shift (i.e., phase shift). This is the self-inductance characteristic of the inductor. When the current in an inductor changes, a changing magnetic field will be generated around the inductor. If the changing magnetic field intersects with another coil, an induced electromotive force will be generated in the other coil. This is the mutual inductance characteristic of the inductor. The mutual inductance characteristic of the inductor can also be used to shift the waveform of the current flowing through the inductor (i.e., phase shift). The mutual inductance coefficient M is a physical quantity that measures the strength of the mutual inductance effect between two inductors. The size of the mutual inductance coefficient M depends on the size, shape, number of turns, and relative position of the inductor. The larger the mutual inductance coefficient M, the stronger the mutual inductance effect between the two inductors.

[0031] In the low noise amplifier provided in the embodiment of the present application, an inductor group 30 is provided between the input circuit 10 and the output circuit 20 of the active path 100, or between the input circuit 10 and the output circuit 20 of the passive path 200, and the inductor group 30 includes a first coil L1 and a second coil L2 with opposite spiral directions. Thus, a current change in one of the first coil L1 and the second coil L2 can induce an induced current with an opposite phase (approximately 180° phase difference) in the other coil, so that the inductor group 30 can shift the signal by a larger phase (such as approximately 180°), that is, the inductor group 30 can shift the signal by a larger phase (such as approximately 180°); and, the self-inductance characteristics of the first coil L1 and the self-inductance characteristics of the second coil L2 enable the inductor group 30 to adjust the signal by a smaller phase on the basis of shifting the signal by a larger phase; in short, the inductor group 30 is used to shift the signal, and finally the phase of the signal output by the active path 100 and the passive path 200 when the active path 100 and the passive path 200 are conducted in time is continuous.

[0032] It should be noted that if Figure 3 As shown, Figure 3 FIG. 1 shows a schematic diagram of a circuit structure of a low noise amplifier in which the inductor group 30 is not provided in both the active path 100 and the passive path 200. Figure 1-Figure 3 It can be seen that when the active path 100 is turned on, the phase of the signal inputted from the signal input terminal RF-IN remains unchanged after passing through the input circuit 10, and then the signal from the control terminal of the first amplifier tube T1 is amplified by the first amplifier tube T1, and the phase of the signal outputted from the first terminal of the first amplifier tube T1 is inverted, that is, the first amplifier tube T1 performs inverted amplification on the signal, and the signal outputted from the first terminal of the first amplifier tube T1 further reaches the second amplifier tube T2, and the second amplifier tube T2 performs in-phase amplification on the signal. After the inverted amplification by the first amplifier tube T1 and the in-phase amplification by the second amplifier tube T2, the signal The signal is finally transmitted to the signal output terminal RF-OUT by the output circuit 20, so that the signal output from the signal output terminal RF-OUT is in phase with the signal input from the signal input terminal RF-IN, and the phase difference is approximately 180°; and when the passive path 200 is turned on, the signal output from the signal output terminal RF-OUT is in phase with the signal input from the signal input terminal RF-IN, and the phase difference is approximately 0°; thus, the phase difference between the signals output by the active path 100 and the passive path 200 when they are turned on in time-sharing is approximately 180°, and the phases of the signals output by the active path 100 and the passive path 200 when they are turned on in time-sharing are discontinuous.

[0033] In the low noise amplifier provided in the embodiment of the present application, an inductor group 30 is provided between the input circuit 10 and the output circuit 20 of the active path 100, and the inductor group 30 is used to perform a phase shift of a larger phase (e.g., approximately 180°) on the signal transmitted by the active path 100, so that the phases of the signals output by the active path 100 and the passive path 200 when they are turned on in time-sharing manner are continuous; or, an inductor group 30 is provided between the input circuit 10 and the output circuit 20 of the passive path 200, and the inductor group 30 is used to perform a phase shift of a larger phase (e.g., approximately 180°) on the signal transmitted by the passive path 200, so that the phases of the signals output by the active path 100 and the passive path 200 when they are turned on in time-sharing manner are continuous; wherein, the phase continuity of the signals output by the active path 100 and the passive path 200 when they are turned on in time-sharing manner means that the phase difference of the signals output by the active path 100 and the passive path 200 when they are turned on in time-sharing manner is less than a certain threshold value, and the threshold value can be set according to actual needs, for example, the threshold value can be ±15°.

[0034] Optionally, in some embodiments of the present application, such as Figure 1As shown, an inductor group 30 is provided between the input circuit 10 and the output circuit 20 of the active path 100, wherein the first end of the first coil L1 is connected to the active path 100; the second end of the first coil L1 and the first end of the second coil L2 are connected as a common end, and are electrically connected to the power supply voltage end VDD, and are connected to the power supply voltage; the second end of the second coil L2 is connected to the active path 100. That is, when the inductor group 30 is located between the input circuit 10 and the output circuit 20 of the active path 100, the signal transmitted by the active path 100 enters from the first end of the first coil L1 of the inductor group 30, passes through the first coil L1 and the second coil L2 of the inductor group 30, and is output from the second end of the second coil L2 of the inductor group 30. The phase of the signal passing through the inductor group 30 is shifted by a large phase (e.g., approximately 180°), and finally the phase of the signal output by the active path 100 and the passive path 200 is continuous.

[0035] Further optional, such as Figure 1 As shown, the active path 100 includes an input circuit 10, a first amplifier tube T1, a second amplifier tube T2, an inductor group 30 and an output circuit 20 which are electrically connected in sequence along the signal transmission direction; The first end of the input circuit 10 is the signal input end RF-IN, and the second end of the input circuit 10 is electrically connected to the control end of the first amplifier tube T1; The control end of the first amplifier tube T1 is also connected to the first bias voltage Vbias1 through the first resistor R1; the first end of the first amplifier tube T1 is electrically connected to the second amplifier tube T2, and the second end of the first amplifier tube T1 is grounded through the feedback circuit 40; the first amplifier tube T1 is used to invert and amplify the signal; The control end of the second amplifier tube T2 is connected to the second bias voltage Vbias2 through the second resistor R2, and is grounded through the first capacitor C1; the first end of the second amplifier tube T2 is electrically connected to the first end of the first coil L1 in the inductor group 30, and the second end of the second amplifier tube T2 is electrically connected to the first end of the first amplifier tube T1; the second amplifier tube T2 is used to amplify the signal in phase; The second end of the second coil L2 in the inductor group 30 is electrically connected to the first end of the output circuit 20 , and the second end of the output circuit 20 is the signal output end RF-OUT.

[0036] Further optional, such as Figure 1 As shown, in the active path 100, a second switch K1 is provided between the first end of the first amplifier tube T1 and the second end of the second amplifier tube T2. The main function of the second switch K1 is that when the second switch K1 is disconnected, the RF signal leakage of the active path 100 can be reduced to improve the linearity.

[0037] When the active path 100 is turned on, the phase of the signal inputted from the signal input terminal RF-IN remains unchanged after passing through the input circuit 10; then, after being amplified by the first amplifier tube T1, the signal of the control terminal of the first amplifier tube T1 is amplified by the first amplifier tube T1, and the phase of the signal outputted from the first terminal of the first amplifier tube T1 is inverted, that is, the first amplifier tube T1 performs inverted amplification on the signal; the signal outputted from the first terminal of the first amplifier tube T1 then reaches the second terminal of the second amplifier tube T2, and after being amplified by the second amplifier tube T2, the phase of the signal outputted from the first terminal of the second amplifier tube T2 remains unchanged, that is, the second amplifier tube T2 performs in-phase amplification on the signal; the signal outputted from the first terminal of the second amplifier tube T2 is then phase-shifted by a large phase (e.g., approximately 180°) after passing through the inductor group 30; thus, the signal after inverted amplification by the first amplifier tube T1, in-phase amplification by the second amplifier tube T2, and inverted phase shift by the inductor group 30 is finally transmitted to the signal output terminal RF-OUT by the output circuit 20, and the signal outputted from the signal output terminal RF-OUT is in-phase with the signal inputted from the signal input terminal RF-IN. When the passive path 200 is turned on, the signal output from the signal output terminal RF-OUT is in phase with the signal input from the signal input terminal RF-IN. In this way, the phases of the signals output by the active path 100 and the passive path 200 are continuous.

[0038] It should be noted that the first amplifier tube T1 may be a single amplifier tube or may include a plurality of sub-amplifier tubes connected in parallel. When the first amplifier tube T1 includes a plurality of sub-amplifier tubes connected in parallel, the gain of the active path 100 may be adjusted by adjusting the number of sub-amplifier tubes connected in the first amplifier tube T1. Of course, the gain of the active path 100 may also be adjusted by adjusting the magnitude of the first bias voltage Vbias1 connected to the first amplifier tube T1 through the first resistor R1.

[0039] Similarly, the second amplifier tube T2 may be a single amplifier tube or may include a plurality of sub-amplifier tubes connected in parallel. When the second amplifier tube T2 includes a plurality of sub-amplifier tubes connected in parallel, the gain of the active path 100 may be adjusted by adjusting the number of sub-amplifier tubes connected in the second amplifier tube T2. Of course, the gain of the active path 100 may also be adjusted by adjusting the magnitude of the second bias voltage Vbias2 connected to the second amplifier tube T2 through the second resistor R2.

[0040] Optional, such as Figure 1 As shown, the inductor group 30 is located between the first end of the second amplifier tube T2 of the active path 100 and the output circuit 20, that is, the inductor group 30 is relatively close to the signal output terminal RF-OUT. This arrangement makes the noise of the active path 100 smaller; and, compared with Figure 1 and Figure 3It can be seen that the first end of the second amplifier tube T2 also needs to be electrically connected to the power supply voltage terminal VDD through a load inductor L0 and connected to the power supply voltage. The inductor group 30 is set between the first end of the second amplifier tube T2 of the active path 100 and the output circuit 20, and the load inductor L0 can be reused as the first coil L1 in the inductor group 30, that is, the inductor group 30 and the load inductor L0 are designed in coordination to form the inductor group 30 of the common power supply terminal, so as to compensate the phase of the output signal to be in phase with the input signal, and at the same time, it is beneficial to simplify the circuit structure of the active path 100.

[0041] In addition, the inductor group 30 is located between the first end of the second amplifier tube T2 of the active path 100 and the output circuit 20, which is also conducive to impedance matching. Specifically, the number of turns of the first coil L1 in the inductor group 30 is W1, and the number of turns of the second coil L2 in the inductor group 30 is W2. The impedance matching can be achieved by adjusting the turn ratio W2 / W1 of the second coil L2 to the first coil L1.

[0042] Further, Figure 4 shows a schematic diagram of the layout structure of the load inductor L0, Figure 5 The schematic diagram of the layout structure of the first coil L1 and the second coil L2 of an inductor group 30 located between the input circuit 10 and the output circuit 20 of the active path 100 in the low noise amplifier provided in the embodiment of the present application is shown, combined with Figure 4 and Figure 5 As shown, the load inductor L0 can be reused as the first coil L1 in the inductor group 30, and in the inductor group 30, the first coil L1 is located in the first metal layer M1, the second coil L2 is located in the second metal layer M2, and the first metal layer M1 and the second metal layer M2 are arranged in different layers; the orthographic projection of the second coil L2 on the first metal layer M1 at least partially overlaps with the first coil L1. In other words, while the load inductor L0 is reused as the first coil L1 in the inductor group 30, the first coil L1 and the second coil L2 in the inductor group 30 can be stacked and wound on two metal layers. In this way, the first coil L1 and the second coil L2 can be located in the same layout area. Although the second coil L2 is added, the area can basically be not increased, and there is no excessive area consumption.

[0043] To verify the above analysis, Figure 6a Shows Figure 3 The simulation test result diagram of the low noise amplifier in which the inductor group 30 is not provided in the active path 100 and the passive path 200 when the active path 100 is turned on is shown in FIG. Figure 6b Shows Figure 3 The simulation test result diagram of the low noise amplifier when the passive path 200 is turned on is shown, wherein the low noise amplifier operates in the B41 frequency band (2.496 GHz ~ 2.69 GHz); Figure 6a and Figure 6b As shown, when the active path 100 and the passive path 200 of the low noise amplifier are not provided with the inductor group 30, the gain range that can be achieved when the active path 100 is turned on is 22.2915dB~22.104dB, and the phase range of the output signal when the active path 100 is turned on is -191.7661deg~-220.707deg; the gain range that can be achieved when the passive path 200 is turned on is -11.7942dB~-11.8514dB, and the phase range of the output signal when the passive path 200 is turned on is -16.04118deg~-40.80646deg; the phase difference between the signals output by the active path 100 and the passive path 200 when they are turned on in time-sharing is about 180°.

[0044] Figure 7a Shows Figure 1 The simulation test result diagram of the low noise amplifier in which the inductor group 30 is arranged between the first end of the second amplifier tube T2 of the active path 100 and the output circuit 20 when the active path 100 is turned on is shown in FIG. Figure 7b Shows Figure 1 The simulation test result diagram of the low noise amplifier when the passive path 200 is turned on is shown, wherein the low noise amplifier operates in the B41 frequency band (2.496 GHz ~ 2.69 GHz); Figure 7a and Figure 7b As shown, when an inductor group 30 is provided between the first end of the second amplifier tube T2 of the active path 100 of the low noise amplifier and the output circuit 20, the gain range that can be achieved when the active path 100 is turned on is 21.1786dB~20.8466dB, and the phase range of the output signal when the active path 100 is turned on is -23.78249deg~-55.75287deg; the gain range that can be achieved when the passive path 200 is turned on is -12.2752dB~-12.6332dB, and the phase range of the output signal when the passive path 200 is turned on is -26.1162deg~-53.34387deg; the phases of the signals output by the active path 100 and the passive path 200 when they are turned on in time sharing are continuous, or in the same phase.

[0045] It should be noted that Figure 1 The case where the inductor group 30 is located between the first end of the second amplifier tube T2 and the output circuit 20 is taken as an example to illustrate the situation where the inductor group 30 is located between the input circuit 10 and the output circuit 20 of the active path 100. However, the present application does not limit the specific position where the inductor group 30 is located between the input circuit 10 and the output circuit 20 of the active path 100.

[0046] Other options, such as Figure 8 As shown, Figure 8The circuit structure diagram of another low noise amplifier provided by the embodiment of the present application is shown. It can be seen that an inductor group 30 can also be set between the first end of the first amplifier tube T1 of the active path 100 and the second end of the second amplifier tube T2. In this way, the inductor group 30 can also be used to perform a large phase shift (such as approximately 180°) on the signal transmitted by the active path 100, so that the phase of the signal output by the active path 100 and the passive path 200 is continuous. However, compared Figure 1 and Figure 8 As shown, the inductor group 30 is arranged between the first end of the second amplifier tube T2 of the active path 100 and the output circuit 20. Compared with the inductor group 30 being arranged between the first end of the first amplifier tube T1 of the active path 100 and the second end of the second amplifier tube T2, it is closer to the signal output end RF-OUT, so that the noise of the active path 100 is smaller and the area can be basically not increased.

[0047] Alternatively, in some embodiments of the present application, Figure 2 As shown, an inductor group 30 is arranged between the input circuit 10 and the output circuit 20 of the passive path 200, wherein the first end of the first coil L1 is connected to the passive path 200; the second end of the first coil L1 and the first end of the second coil L2 are connected as a common end and electrically connected to the ground; the second end of the second coil L2 is connected to the passive path 200. That is to say, when the inductor group 30 is located between the input circuit 10 and the output circuit 20 of the passive path 200, the signal transmitted by the passive path 200 enters from the first end of the first coil L1 of the inductor group 30, passes through the first coil L1 and the second coil L2 of the inductor group 30, and is output from the second end of the second coil L2 of the inductor group 30. The phase of the signal passing through the inductor group 30 is shifted by a large phase (e.g., approximately 180°), and finally the phase of the signal output by the active path 100 and the passive path 200 is continuous.

[0048] Further optional, such as Figure 2 As shown, the passive path 200 includes an input circuit 10, a first switch K2, a first attenuation circuit P1, a second capacitor C2 and an output circuit 20 which are electrically connected in sequence along the signal transmission direction, and the inductor group 30 is located between the first switch K2 and the second capacitor C2.

[0049] Specifically, refer to Figure 2As shown, the inductor group 30 may be located between the first switch K2 of the passive path 200 and the first attenuation circuit P1; or, the inductor group 30 may be located between the first attenuation circuit P1 of the passive path 200 and the second capacitor C2; or, the inductor group 30 may be located on a path where the first attenuation circuit P1 overlaps with the passive path 200. For example, the first attenuation circuit P1 may be a gate-type attenuation circuit structure, which may specifically include a resistor R11, a resistor R12, and a resistor R13, wherein a first end of the resistor R11 is electrically connected to a first node N1 of the passive path 200, the first node N1 is electrically connected to the first switch K2, and the first node N1 is grounded through the resistor R12, a second end of the resistor R11 is electrically connected to a second node N2 of the passive path 200, the second node N2 is electrically connected to the second capacitor C2, and the second node N2 is grounded through the resistor R13. At this time, the inductor group 30 may be located between the first node N1 and the first end of the resistor R11, or, the inductor group 30 may be located between the second end of the resistor R11 and the second node N2.

[0050] The present application does not limit the circuit structure of the first attenuation circuit P1 in the passive path 200. The first attenuation circuit P1 may be as follows: Figure 2 The gate attenuation circuit structure shown in Fig. 9 As shown, the first attenuation circuit P1 may also be a T-type attenuation circuit structure, or a resistor network structure, etc., depending on the specific situation.

[0051] When the passive path 200 is turned on, the signal inputted by the signal input terminal RF-IN undergoes a phase shift of a large phase (e.g., approximately 180°) after passing through the inductor group 30, so that the signal outputted by the signal output terminal RF-OUT is in antiphase with the signal inputted by the signal input terminal RF-IN; and when the active path 100 is turned on, the signal inputted by the signal input terminal RF-IN undergoes an inverting amplification by the first amplifier tube T1 and a non-inverting amplification by the second amplifier tube T2, so that the signal outputted by the signal output terminal RF-OUT is in antiphase with the signal inputted by the signal input terminal RF-IN; in this way, the phases of the signals outputted by the active path 100 and the passive path 200 when they are turned on in time sharing are continuous.

[0052] It can be understood that since the passive path 200 is applied to the low gain range (less than 0 dB), the passive path 200 itself has attenuation characteristics. Therefore, after the inductor group 30 is introduced between the input circuit 10 and the output circuit 20 of the passive path 200, the insertion loss of the inductor group 30 to the signal can be incorporated into the insertion loss design of the passive path 200. In this way, the performance requirements of the inductor group 30 are very low, and the two coils of the inductor group 30 can be designed under the constraint of compressing the area as much as possible. In other words, the area of ​​the inductor group 30 can be made very small, and the passive path 200 has the performance of phase shifting, high linearity, etc. without introducing a larger area; and, by introducing the inductor group 30 between the input circuit 10 and the output circuit 20 of the passive path 200, but not introducing the inductor group 30 between the input circuit 10 and the output circuit 20 of the active path 100, the gain of the active path 100 can be completely unaffected by the introduction of the inductor group 30, that is, the active path 100 can maintain a relatively high gain.

[0053] Fig.10 The schematic diagram of the layout structure of the first coil L1 and the second coil L2 of an inductor group 30 located between the input circuit 10 and the output circuit 20 of the passive path 200 in the low noise amplifier provided in the embodiment of the present application is shown as follows: Fig.10 As shown, in the inductor group 30, the first coil L1 is located in the first metal layer M1, the second coil L2 is located in the second metal layer M2, and the first metal layer M1 and the second metal layer M2 are arranged in different layers; the orthographic projection of the second coil L2 on the first metal layer M1 at least partially overlaps with the first coil L1. In other words, the first coil L1 and the second coil L2 in the inductor group 30 can be wound up and down in two metal layers, so that the first coil L1 and the second coil L2 can be located in the same layout area to minimize the area of ​​the introduced inductor group 30.

[0054] Fig.11a Shows Figure 2 The simulation test result diagram of the low noise amplifier with the inductor group 30 arranged between the first switch K2 of the passive path 200 and the first attenuation circuit P1 when the active path 100 is turned on is shown in FIG. Fig.11b Shows Figure 2 The simulation test result diagram of the low noise amplifier when the passive path 200 is turned on is shown, wherein the low noise amplifier operates in the B41 frequency band (2.496 GHz ~ 2.69 GHz); Fig.11a and Fig.11bAs shown, when the inductor group 30 is arranged between the first switch K2 and the first attenuation circuit P1 of the passive path 200 of the low noise amplifier, the gain range that can be achieved when the active path 100 is turned on is 22.3435dB~22.1979dB, and the phase range of the output signal when the active path 100 is turned on is -191.9956deg~-221.345deg; the gain range that can be achieved when the passive path 200 is turned on is -12.2323dB~-11.994dB, and the phase range of the output signal when the passive path 200 is turned on is -187.5042deg~-225.4757deg; the phases of the signals output by the active path 100 and the passive path 200 when they are turned on in time sharing are continuous, or in the same phase.

[0055] In the above-mentioned embodiments, the inductor group 30 is mainly provided between the input circuit 10 and the output circuit 20 of the active path 100, or between the input circuit 10 and the output circuit 20 of the passive path 200, so as to perform a phase shift of a larger phase (approximately 180°). Although the self-inductance characteristics of the first coil L1 and the self-inductance characteristics of the second coil L2 in the inductor group 30 can also be used to adjust the signal to a smaller phase, further, in order to achieve accurate compensation of the signal phase at different gain levels and achieve a high phase continuity, optionally, in some embodiments of the present application, such as Figure 1-Figure 2 , Figure 8-Figure 9 as well as Figure 12-Figure 17 As shown, the low noise amplifier may further include a phase fine-tuning unit 50, which includes at least one capacitor and / or at least one inductor. The inductor group 30 and the phase fine-tuning unit 50 together make the phase of the signal output by the active path 100 and the passive path 200 continuous. That is, the signal transmitted by the active path 100 or the passive path 200 is shifted by a larger phase (approximately 180°) through the inductor group 30, and the signal transmitted by the active path 100 or the passive path 200 is compensated by a smaller phase through the phase fine-tuning unit 50, so that the signal output by the active path 100 and the passive path 200 in a time-sharing manner achieves a high phase continuity.

[0056] It should be noted that the present application does not limit the electrical connection position of the phase fine-tuning unit 50, and the present application does not limit the specific circuit structure of the phase fine-tuning unit 50, as long as the inductor group 30 and the phase fine-tuning unit 50 jointly make the phase of the signal output by the active path 100 and the passive path 200 being turned on in time-sharing continuous.

[0057] On this basis, optional Fig.12 and Fig.13As shown, the phase fine-tuning unit 50 includes a first phase fine-tuning unit 51, and the inductor group 30 and the first phase fine-tuning unit 51 are co-located between the input circuit 10 and the output circuit 20 of the active path 100. That is, the inductor group 30 is used to perform a larger phase shift on the signal transmitted by the active path 100, and the first phase fine-tuning unit 51 is used to perform a smaller phase compensation on the signal transmitted by the active path 100, so that the phases of the signal output by the active path 100 and the signal output by the passive path 200 are highly continuous.

[0058] Further optional, such as Fig.12 and Fig.13 As shown, at least one of the first end of the first coil L1 and the second end of the second coil L2 in the inductor group 30 is also grounded through a first phase fine-tuning unit 51. Fig.12 and Fig.13 As shown, the second end of the second coil L2 in the inductor group 30 is grounded through a first phase fine-tuning unit 51; or, the first end of the first coil L1 in the inductor group 30 is grounded through a first phase fine-tuning unit 51; or, the first end of the first coil L1 in the inductor group 30 is grounded through a first phase fine-tuning unit 51, and the second end of the second coil L2 in the inductor group 30 is grounded through a first phase fine-tuning unit 51.

[0059] Specifically, Fig.12 and Fig.13 As shown, the first phase fine-tuning unit 51 may include a third capacitor C3 and / or a third coil L3. Taking the second end of the second coil L2 in the inductor group 30 being grounded through a first phase fine-tuning unit 51 as an example, when the first phase fine-tuning unit 51 includes the third capacitor C3, the second end of the second coil L2 in the inductor group 30 is grounded through the third capacitor C3, as shown in FIG. Fig.12 As shown; when the first phase fine-tuning unit 51 includes the third coil L3, the second end of the second coil L2 in the inductor group 30 is grounded through the third coil L3; when the first phase fine-tuning unit 51 includes the third capacitor C3 and the third coil L3, the third coil L3 and the third capacitor C3 can be connected in series or in parallel, for example: Fig.13 The second end of the second coil L2 in the middle inductor group 30 is grounded through the third coil L3 and the third capacitor C3 in sequence.

[0060] It can be understood that when the first phase fine-tuning unit 51 includes the third coil L3, and the third coil L3 is electrically connected to the first coil L1 or the second coil L2, Fig.13As shown, the third coil L3 can be wound continuously with the corresponding electrically connected first coil L1 or second coil L2. At this time, the third coil L3 and the corresponding electrically connected first coil L1 or second coil L2 are an integral coil, and the second end of the third coil L3 is connected to the active path 100 as a tap end in the middle of the integral coil.

[0061] Optional, such as Fig.14 and Fig.15 As shown, the phase fine-tuning unit 50 includes a first phase fine-tuning unit 51, and the inductor group 30 and the first phase fine-tuning unit 51 are co-located between the input circuit 10 and the output circuit 20 of the passive path 200. That is, the inductor group 30 is used to perform a larger phase shift on the signal transmitted by the passive path 200, and the first phase fine-tuning unit 51 is used to perform a smaller phase compensation on the signal transmitted by the passive path 200, so that the phase of the signal output by the passive path 200 and the signal output by the active path 100 are highly continuous.

[0062] Further optional, such as Fig.14 and Fig.15 As shown, at least one of the first end of the first coil L1 and the second end of the second coil L2 in the inductor group 30 is also grounded through a first phase fine-tuning unit 51. Fig.14 and Fig.15 As shown, the second end of the second coil L2 in the inductor group 30 is grounded through a first phase fine-tuning unit 51; or, the first end of the first coil L1 in the inductor group 30 is grounded through a first phase fine-tuning unit 51; or, the first end of the first coil L1 in the inductor group 30 is grounded through a first phase fine-tuning unit 51, and the second end of the second coil L2 in the inductor group 30 is grounded through a first phase fine-tuning unit 51.

[0063] Specifically, Fig.14 and Fig.15 As shown, the first phase fine-tuning unit 51 may include a third capacitor C3 and / or a third coil L3. Taking the second end of the second coil L2 in the inductor group 30 being grounded through a first phase fine-tuning unit 51 as an example, when the first phase fine-tuning unit 51 includes the third capacitor C3, the second end of the second coil L2 in the inductor group 30 is grounded through the third capacitor C3, as shown in FIG. Fig.14 As shown; when the first phase fine-tuning unit 51 includes the third coil L3, the second end of the second coil L2 in the inductor group 30 is grounded through the third coil L3; when the first phase fine-tuning unit 51 includes the third capacitor C3 and the third coil L3, the third coil L3 and the third capacitor C3 can be connected in series or in parallel, for example: Fig.15 The second end of the second coil L2 in the middle inductor group 30 is grounded through the third coil L3 and the third capacitor C3 in sequence.

[0064] It can be understood that when the first phase fine-tuning unit 51 includes the third coil L3, and the third coil L3 is electrically connected to the first coil L1 or the second coil L2, Fig.15 As shown, the third coil L3 can be wound continuously with the corresponding electrically connected first coil L1 or second coil L2. At this time, the third coil L3 and the corresponding electrically connected first coil L1 or second coil L2 are an integral coil, and the second end of the third coil L3 is connected to the passive path 200 as a tap end in the middle of the integral coil.

[0065] Another option, such as Fig.16 and Fig.17 As shown, the phase fine adjustment unit 50 includes a second phase fine adjustment unit 52 .

[0066] Further optional, such as Fig.16 As shown, the inductor group 30 is located between the input circuit 10 and the output circuit 20 of the active path 100, and the second phase fine-tuning unit 52 is located between the input circuit 10 and the output circuit 20 of the passive path 200, that is, the inductor group 30 is used to perform a larger phase shift on the signal transmitted by the active path 100, and the second phase fine-tuning unit 52 is used to perform a smaller phase compensation on the signal transmitted by the passive path 200, so that the phases of the signal output by the active path 100 and the signal output by the passive path 200 are highly continuous.

[0067] Another alternative is, Fig.17 As shown, the inductor group 30 is located between the input circuit 10 and the output circuit 20 of the passive path 200, and the second phase fine-tuning unit 52 is located between the input circuit 10 and the output circuit 20 of the active path 100, that is, the inductor group 30 is used to perform a larger phase shift on the signal transmitted by the passive path 200, and the second phase fine-tuning unit 52 is used to perform a smaller phase compensation on the signal transmitted by the active path 100, so that the phase of the signal output by the passive path 200 and the signal output by the active path 100 are highly continuous.

[0068] Another option is, Figure 1-Figure 2 , Figure 8-Figure 9 as well as Figure 12-Figure 17 As shown, the phase fine-tuning unit 50 may include a third phase fine-tuning unit 53; the output circuit 20 includes a fourth capacitor C4 and a second attenuation circuit P2 electrically connected in sequence along the signal transmission direction, and the common end of the fourth capacitor C4 and the second attenuation circuit P2 is grounded through the third phase fine-tuning unit 53.

[0069] Optionally, the third phase fine-tuning unit 53 includes a fifth capacitor C5.

[0070] Optionally, the second attenuation circuit P2 can be a gate-type attenuation circuit structure, which can specifically include a resistor R21, a resistor R22 and a resistor R23, wherein the first end of the resistor R21 is electrically connected to the fourth capacitor C4, and the first end of the resistor R21 is grounded through the resistor R22, the second end of the resistor R21 is the signal output end RF-OUT, and the second end of the resistor R21 is grounded through the resistor R23.

[0071] The present application does not limit the circuit structure of the second attenuation circuit P2. The second attenuation circuit P2 may be a gate attenuation circuit structure, a T-type attenuation circuit structure, a resistor network structure, etc., depending on the specific situation. By adjusting the second attenuation circuit P2, the gains of the active path 100 and the passive path 200 may also be adjusted.

[0072] The output circuit 20 is the output matching network of the active path 100. The output matching network of the active path 100 is responsible for effectively transmitting the amplified signal of the active path 100 to the signal output terminal RF-OUT, and can play multiple roles such as signal matching and transmission, noise suppression and isolation, stability and gain flatness, output power and efficiency optimization, impedance transformation and signal conditioning.

[0073] Based on any of the above embodiments, optionally, in some embodiments of the present application, such as Figure 1-Figure 2 , Figure 8-Figure 9 as well as Figure 12-Figure 17 As shown, the input circuit 10 includes an inductor L4 and a capacitor C6, the first end of the inductor L4 is the signal input end RF-IN, the second end of the inductor L4 is electrically connected to the first end of the capacitor C6, and the second end of the capacitor C6 is electrically connected to the control end of the first amplifier tube T1.

[0074] The inductor L4, the capacitor C6, the first resistor R1, the first amplifier T1 (mainly the parasitic capacitor Cgs1 of the first amplifier T1) and the feedback circuit 40 constitute an input matching network of the active path 100. The input matching network is a typical source degeneration structure.

[0075] It should be noted that if the parasitic capacitance Cgs1 of the first amplifier tube T1 is insufficient, a capacitance may be added between the control terminal and the second terminal of the first amplifier tube T1 , depending on the specific situation.

[0076] It can be understood that the input matching network of the active path 100 is responsible for effectively transmitting the signal received by the signal input terminal RF-IN to the active path 100 for amplification, and can play a role in signal matching and transmission, noise suppression, gain and linearity optimization, and reverse isolation improvement.

[0077] Optional, such as Figure 1-Figure 2 , Figure 8-Figure 9 as well as Figure 12-Figure 17As shown, the common end of the inductor L4 and the capacitor C6 is grounded through the third attenuation circuit P3. In the low noise amplifier, the attenuation circuit is set at the signal input end to adjust the amplitude of the input signal to adapt it to the processing range of the low noise amplifier, ensuring that the signal will not be distorted or damage the amplifier due to excessive amplitude during the amplification process; although the attenuation circuit itself will increase a certain amount of noise, in some cases, it can optimize the overall noise performance of the amplifier by adjusting the signal amplitude, and the attenuation circuit can also help improve the linearity of the amplifier.

[0078] Accordingly, an embodiment of the present application further provides a radio frequency module, including the low noise amplifier provided by any of the above embodiments. Since the circuit structure of the low noise amplifier has been described in detail in the above embodiments, it will not be repeated here.

[0079] The various parts in this manual are described in a combination of parallel and progressive ways. Each part focuses on the differences from other parts, and the same or similar parts between the various parts can be referenced to each other.

[0080] With respect to the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other, so that professionals in the field can implement or use the present application. Various modifications to these embodiments will be apparent to professionals in the field, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low noise amplifier, characterized in that: comprising an active path and a passive path, wherein the active path and the passive path share an input circuit and an output circuit; The active path and the passive path are turned on in a time-sharing manner, and the gain range of the active path is at least partially greater than the gain range of the passive path; An inductor group is provided between the input circuit and the output circuit of the active path, or between the input circuit and the output circuit of the passive path. The inductor group includes a first coil and a second coil. The spiral direction of the first coil is opposite to that of the second coil. The inductor group is used to phase shift the signal so that the phases of the signals output by the active path and the passive path in time-sharing conduction are continuous.

2. The low noise amplifier according to claim 1, characterized in that: The inductor group is arranged between the input circuit and the output circuit of the active path; The first end of the first coil is connected to the active path; the second end of the first coil and the first end of the second coil are connected as a common end and electrically connected to the power supply voltage end; the second end of the second coil is connected to the active path.

3. The low noise amplifier according to claim 2, characterized in that: The active path includes the input circuit, the first amplifier tube, the second amplifier tube, the inductor group and the output circuit which are electrically connected in sequence along the signal transmission direction; The first end of the input circuit is a signal input end, and the second end of the input circuit is electrically connected to the control end of the first amplifier tube; The control end of the first amplifier tube is also connected to the first bias voltage through the first resistor; the first end of the first amplifier tube is electrically connected to the second amplifier tube, and the second end of the first amplifier tube is grounded through the feedback circuit; the first amplifier tube is used to invert and amplify the signal; The control end of the second amplifier tube is connected to the second bias voltage through the second resistor and is grounded through the first capacitor; the first end of the second amplifier tube is electrically connected to the first end of the first coil in the inductor group, and the second end of the second amplifier tube is electrically connected to the first end of the first amplifier tube; the second amplifier tube is used to amplify the signal in phase; The second end of the second coil in the inductor group is electrically connected to the first end of the output circuit, and the second end of the output circuit is a signal output end.

4. The low noise amplifier according to claim 1, characterized in that: The inductor group is arranged between the input circuit and the output circuit of the passive path; The first end of the first coil is connected to the passive path; the second end of the first coil and the first end of the second coil are connected as a common end and electrically connected to the ground; the second end of the second coil is connected to the passive path.

5. The low noise amplifier according to claim 4, characterized in that: The passive path includes the input circuit, the first switch, the first attenuation circuit, the second capacitor and the output circuit which are electrically connected in sequence along the signal transmission direction, and the inductor group is located between the first switch and the second capacitor.

6. The low noise amplifier according to claim 5, characterized in that: The inductor group is located between the first switch and the first attenuation circuit; Alternatively, the inductor group is located between the first attenuation circuit and the second capacitor; Alternatively, the inductor group is located on a path where the first attenuation circuit overlaps with the passive path.

7. The low noise amplifier according to any one of claims 1 to 6, characterized in that: In the inductor group, the first coil is located in a first metal layer, the second coil is located in a second metal layer, and the first metal layer and the second metal layer are arranged in different layers; The orthographic projection of the second coil on the first metal layer at least partially overlaps with the first coil.

8. The low noise amplifier according to any one of claims 1 to 6, characterized in that: The low noise amplifier also includes a phase fine-tuning unit, which includes at least one capacitor and / or at least one inductor. The inductor group and the phase fine-tuning unit together make the phases of the signals output by the active path and the passive path being turned on in time-sharing continuous.

9. The low noise amplifier according to claim 8, characterized in that: The phase fine-tuning unit includes a first phase fine-tuning unit, and the inductor group and the first phase fine-tuning unit are located between the input circuit and the output circuit of the active path, or between the input circuit and the output circuit of the passive path.

10. The low noise amplifier according to claim 9, characterized in that: At least one of the first end of the first coil and the second end of the second coil in the inductor group is also grounded through one of the first phase fine-tuning units.

11. The low noise amplifier according to claim 10, characterized in that: The first phase fine-tuning unit includes a third capacitor and / or a third coil; When the first phase fine-tuning unit includes the third coil, and the third coil is electrically connected to the first coil or the second coil, the third coil and the corresponding electrically connected first coil or the second coil are wound continuously.

12. The low noise amplifier according to claim 8, characterized in that: The phase fine-tuning unit includes a second phase fine-tuning unit; The inductor group is located between the input circuit and the output circuit of the active path, and the second phase fine-tuning unit is located between the input circuit and the output circuit of the passive path; Alternatively, the inductor group is located between the input circuit and the output circuit of the passive path, and the second phase fine-tuning unit is located between the input circuit and the output circuit of the active path.

13. The low noise amplifier according to claim 8, characterized in that: The phase fine-tuning unit includes a third phase fine-tuning unit; the output circuit includes a fourth capacitor and a second attenuation circuit electrically connected in sequence along the signal transmission direction, and the common end of the fourth capacitor and the second attenuation circuit is grounded through the third phase fine-tuning unit.

14. A radio frequency module, characterized in that: A low noise amplifier comprising the low noise amplifier according to any one of claims 1 to 13.

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